A regular monoaxial screw is an orthopedic implant commonly used in spinal instrumentation systems to stabilize the vertebral column. It consists of a threaded screw shaft and a fixed head, meaning the head cannot move or rotate relative to the screw body. This rigid configuration allows surgeons to apply precise corrective forces and maintain strong fixation when attaching rods and other spinal components.

These screws are typically manufactured from biocompatible materials such as titanium alloy or stainless steel, which offer excellent strength, corrosion resistance, and compatibility with the human body. The screw is inserted into the pedicle of a vertebra, where it anchors securely in the bone. A spinal rod is then connected to the screw head and locked using a cap or nut to stabilize the spine.

Regular monoaxial screws are widely used in spinal fusion surgeries, deformity correction (such as scoliosis), trauma stabilization, and treatment of degenerative spinal conditions. Their rigid structure provides greater stability and stronger corrective forces compared to movable-head (polyaxial) screws.

3. Key Features

• Fixed head design – the head does not move relative to the screw shaft.
• High rigidity and stability for strong spinal fixation.
• Threaded shaft for secure anchoring in vertebral bone.
• Compatible with rods and locking caps in spinal fixation systems.
• Made from biocompatible materials such as titanium alloy or stainless steel.
• Available in various lengths and diameters for different vertebral levels.
• Provides strong corrective force for spinal deformity correction.

4. Applications

• Spinal fusion surgery to stabilize vertebrae.
• Scoliosis and spinal deformity correction.
• Treatment of spinal trauma and fractures.
• Degenerative spine disease stabilization.
• Spinal tumor or infection-related stabilization.
• Orthopedic spinal instrumentation systems used in hospitals and surgical centers.